 Now, one afternoon, Mr. Utterson visits Dr. Jekyll, and he goes into his private study and sits down. Now, Mr. Utterson notices that Dr. Jekyll looks particularly sick, and he asks him directly, are you covering up for Mr. Hyde? Dr. Jekyll says no, and that Mr. Hyde is already gone, never to be seen again. And Dr. Jekyll then showed Mr. Utterson a letter that Mr. Hyde wrote. Mr. Utterson looks at that letter and decides to keep it. Then he goes over to Mr. Poole and says, did this letter arrive in the mail today? Mr. Poole said no, we didn't get any mail today. Mr. Utterson began to suspect that maybe Mr. Hyde wrote this letter in Dr. Jekyll's study. So he decides to go seek his friend, Mr. Guest, who happens to be an expert in handwriting. They sit and look at Mr. Hyde's letter. Now, Mr. Utterson has another letter from Dr. Jekyll, who's an invitation. So Mr. Guest asks Mr. Utterson if he could see that letter and use it as a comparison with Mr. Hyde's letter. In comparing the two letters, he realizes that they're the same and that the only difference between the two letters is the slant.